Proceedings of International Conference on Advancements in Engineering and Technology
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Advanced mobile signal jammer for GSM, CDMA and 3G Networks with prescheduled time duration using ARM7 TDMI processor based LPC2148 controller 1
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Kaku Ramakrishna, Tulasi Sanath Kumar PG Student, Asst. Professor, Department of Electronics & Communication Engineering, ASCET, Gudur, A.P, India
Abstract : This Paper is designed and implemented for mobile phone signal jammers for GSM, CDMA and 3G networks with prescheduled time duration using ARM7.the mobile jammers block mobile phone use by sending out radio waves along the same frequencies that mobile phone use .this case enough interference with the communication between mobile phone and communicating towers to render the phones unusable .upon activating mobile jammers all mobile phones will indicate “NO NETWORK AVAILABLE” . Incoming calls are blocked as if the mobile phone were off. When the mobile jammers are turned off, all mobile phones will automatically re-establish communications and provide full service .the activation and deactivation time schedules can be programmed with microcontroller. Real time clock chip DS1307 is used to set the schedule. In this project we have a jammer section, microcontroller. RTC and GSM modem .this information is given to the microcontroller will send data to GSM just before the select time and GSM will send message to the users whose number are programmed in the GSM that the jammer is going to active and communication will be stopped. After message sent by GSM. Mobile jammer circuit will active and signal are jammed or blocked.
be mentioned that cell phone jammers are illegal devices in most countries. II.
A. Mobile jammer: .a mobile phone jammer is an instrument used to prevent cellular phones from receiver signal from based station. When used, the jammer effectively disables cellular phones. This device can be used in practically any location, but are found primarily in places where a phone call would be particularly in places where a phone call would be particularly disruptive because silence is expected. As with other radio jamming, cell phone jammers block cell phone use by sending out radio waves along the same frequencies that cellular phone use. These causes enough interface with the communication between cell phones and towers to radar the phones unusable. On most retail phones, the network would simply appear out of range. Most cell phones use different bands to send and receive communications from towers (called frequency division depleting, FDD). Jammers can work by either disrupting phone to tower frequencies or tower to phone frequencies. Smaller handheld models block all bands from 800 MHz to 1900 MHz within a 30-foot range (9meters). Small devices tend to used the former method, while larger more expensive models many interfere directly with the tower
Keywords: mobile jammer, ARM7.RTC, GSM modem I.
RELATED WORK
INRODUCTION
Communication jamming device were first developed and used by military. This interest comes from the fundamental objective of denying the successful transport of information from the sender (tactical commander) to the receiver (the army personnel), and vice-versa. Nowadays, mobile phones are becoming essential tool in our daily life. The technology behind cell phone jamming is very simple. The widely use the mobile phone could create some problems as the sound of ringing becomes annoying or disrupting. This could happen in some places like conference room, aw court, libraries, lecture room and mosques.
signals
The jamming device broadcasts an RF signal in the frequency range reserved for cell phones that interference with the cell phone signal, which results in a “no network available” display on the cell phone screen. All phones with in the effective radius of the jammer are science. It should
Base station Figure 1. basic principal mobile signal jammer
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International Association of Engineering and Technology for Skill Development 58
Proceedings of International Conference on Advancements in Engineering and Technology a.
The GSM jammer is a device that transmit signal on the same frequency at which the GSM system operates, the jamming success when the mobile phone in the area where the jammer is located can’t communicate, the basic idea military use that was called denial of service attack. Mobile jammer is used to prevent mobile phone from receiving or transmitting signal with the base stations. When used, the jammer effectively disables cellular phones. There are several ways to jam an RF device. The three most common techniques can be categorized as follows: i.
b. Circuitry: The main electronic components of a jammer are: Voltage-controlled oscillator--generates the radio signal that will interface with the cell phone signal.
In this kind of jamming, the device forces the mobile to turn off itself. This type is very difficult to be implemented since the jamming device first detects any mobile phone in a specific area, then the device sends the signal to disable the mobile phone .some type of this technique can detect if a nearby mobile phone is there and sends a message to tell the user to switch the phone to the silent mode (intelligent beacon disablers).
Tuning circuit – controls the frequency at which the jammer broad cast its signal by sending a particular voltage to the oscillator Noise generator: -- produces random electronic output in a specified frequency range to jam the cell-phone network signal (part of the tuning circuit) RF amplification (gain stage)—boost the power of the radio frequency output to high enough level to jam a signal
Shielding attacks:
This is known as TEMPEST or EMF shielding. This kind required closing an area in a faraday cage so that any device inside this cage cannot transmit or receiver RF signal from outside of the cage. This area can be large as buildings. iii.
Check your phone: -- if the battery on your phone is okay and you’d like to continue your conversation, try walking away from the the area. You may be able to get out of the jammer’s range with just a few steps.
Denial of service
c. Antenna:
This technique is referred to DOS. In this technique, the device transmits a noise signal at the same operating frequency of the mobile phone in order to decrease the signal -to-noise ratio (SNR) of the mobile under its minimum value. This kind of jamming technique is the simplest one since the device is always on. Our device is of this type.
Power supply
IF section
Power supply:
Smaller jamming device are battery operated. Some look like cell-phone batteries. Stronger device can be plugged into a standard outlet or wired in to a vehicle’s electrical system.
Spoofing
ii.
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RF section
Every jamming device has an antenna to send the signal. Some are contained rical cabinet. On stronger device, antennas are external to provide longer range and tuned for individual frequencies. The effect of jamming depends on the jamming-to- signal ratio (j/s), modulation schema, channel coding and interleaving of the target system. Generally jamming-tosignal ratio can measure according to the following equation
Jamming signal
=
Pj=jammer power,Pt-transmitter power, Gjr=antenna gain from jammer to receiver , Grj=antenna gain from receiver to jammer , Gtr=antenna gain from transmitter to receiver , Grt=antenna gain from receiver to transmitter, Br=communication receiver bandwidth, Bj=jamming transmitter bandwidth, Rtr=rang between communication transmitter and receiver, Rjt=range between jammer and communication receiver, Lr=jammer signal loss, Lr=communication signal loss
Figure2. Block diagram of the jammer device B. Component of mobile jammer: Electronically speaking, cell-phone jammers are very basic device. The simplest just have an on/off and a light that indicates it’s on. More complex device have switches to activate jamming at different frequencies. Components of jammer include:
Jammers simply overflow the frequency used by wireless phones with radio waves. Jamming signal needs enough power to collide and cancel GSM signal. Cell phones are
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Proceedings of International Conference on Advancements in Engineering and Technology
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D. ARM7TDMI:
designed to increase their power when facing low level interface. Jammer should recognize that power. Power of jamming signal should match the power increase from the phone.
ARM is the abbreviation of advanced RISC machines, it the names of a class of processor, and is the name of kind technology too. The RISC instruction set, and related decode mechanism are much simpler than those of complex instruction set computer (CISC) design. E. Liquid-crystal display (LCD): A flat panel display electronic visual display that uses the light modulation properties of liquid crystal. Liquid crystals do not emit light directly.LCD are available to display arbitrary image or fixed image which can be displayed or hidden, such as preset words, digits, and 7segment displays as in a digital clock. They use the same basic technology, except that arbitrary image is made up of a large number of small pixels, while other displays have large elements.
Sophisticated jammers can block several networks to head off dual or tri-mode phone that automatically switch among different network to find open signal.highend device can block all frequencies.
F. Global system for mobile communication (GSM): GSM/GPRS RS232 modem from rhydoLABZ is built with SIMCOM make sim900 quad-band GSM/GPRS engine .GSM, which stands for global system for mobile communication, reigns (important) as the world’s most widely used cell phone technology. Cell phones use a cell phone service carrier’s GSM network by searching for cell phone towers in the nearby area. Global system for mobile communication (GSM) is globally accepted standard for digital cellular communication. GSM is the name of a standardization group established in 1982 to create a common European mobile telephone standard that would formulate specification for a pan-European mobile cellular radio system operating at 900 MHz it is estimated that many countries outside of Europe will join the GSM partnership.
GSM(global system for mobile communication) ranges erope900 MHz, asia-1800 MHz, USA-1.9 MHz C. Micro controller: This section forms the control unit of the whole project. This section basically consists of a microcontroller with its associated circuitry like crystal with capacitors, reset circuit, pull up resistors (if needed) and so on.
Table 1: Operating frequency bands
The microcontroller forms the heart of the project because it controls the drives begins interfaced and communicates with the drives according to the program being written. a microcontroller is a small computer on a single integrated circuit consisting of a relatively simple CPU combined with support function such as crystal oscillator ,timers, watchdog timer, serial and analog i/o etc. microcontroller are also used in specific, high technology, and aerospace projects. Microcontrollers are designed for small or dedicated application.
UPLINK (Handset transmit)
DOWNLINK (handset receive)
USED IN JORDAN BY:
GSM 900
890-915 MHz
935-960MHZ
Zain+orange
DCS 1800
1710-1785 MHz
1805-1880 MHz
Ummiah
In our design, the jamming frequency must be the same the downlink, because it needs lower power to do jamming then the uplink rang and there is no need to jam the base station itself. So, our frequency design will be as follows:
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International Association of Engineering and Technology for Skill Development 60
Proceedings of International Conference on Advancements in Engineering and Technology GSM 900---GSM 1800
-- 935-960 MHz
One LCD (liquid crystal display) also interface in this micro controller, it is flat electronic visual display that used that use the light modulating properties of liquid crystals. These components are specialized for being used with the microcontrollers, which means that they cannot be activated by standard IC circuits.
1805-1880 MHz
The CDMA frequency range will be 860-894 MHz (Asia&Europe) and 850-894 MHz (United States). III.
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HARDWEARE IMPLEMENTATION:
RTC (real time clock) is interface because it is widely used device that provides accurate time and date for many applications. LED indicator interface in this microcontroller it have a life of at last ten years and consumer 90 percent less power than conventional indicators, depend on the type of the materials (Ga, AS, p).
The below fig.3 is the block diagram of the system that to set the scheduled time duration for mobile jammer. The activation and deactivation time schedules can be programmed with microcontroller. In order to run the RTC (real time clock) one crystal oscillator is externally interfaced, an oscillator is an electronic circuit that produces a repetitive electronic signal. The power supply interfaced it is used to battery backup for the purpose of update the time when the absence of power. The A.C input i.e., 230v from the mains supply is step down by the transformer to 12v and is fed to a rectifier. One reset button interface, Reset is used for putting the microcontroller into a ‘known’ condition. That partially means that microcontroller can behave rather inaccurately under certain undesirable condition. In order to continuous its proper functioning it has to be reset. Relay is an electrically controllable switch widely used in industrial controls, automobile and appliances.
IV.
LEGAL ISSUES:
India: government and schools use jammers. United States: illegal to operate, manufacture, import, or offer of up to $11,000 and imprisonment of up to one year. Pakistan: legal inside bank, often used also in libraries. United Kingdom: illegal to use, but legal to V.
CONCOLUSION:
This paper is successfully completed using mobile jammer and ARM7.by this system we can deactivate all the mobile signals at any locations. We designed a device that stops phone ringing in particular time period. This device could be used in places where ringing is not desired at specific times, as these ringing may disturb people in such place. The design drive works in dual band. It jams both the GSM900 and GSM1800 bands. The device was able to jam the three main cell phone carriers in Jordan
Power supply
RTC LCD Driver I2C
VI.
LCD
[1] www.howstuffwork.com
ARM7
[2] en.wikipedia.org/wiki/mobile_phone_jammer
LPC2148 GSM modem
Micro controller
REFERENCE
Relay Driver
Relay
[3] multitopic conference2008.INMIC 2008. [4]ccnga.uwaterloo.ca/jscouria/GSM/gsmreporter.html
Jammer circuitry RS232 interface
[5]ieeee explore.com [6]”zone of scilence[cell phone jammer],”spectrum, ieee
Crystal Oscillator
Vol.42,no.5,18,may2005. LED indicators
Reset
Figure: block diagram system
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